Homosexuality refers to sexual behavior with or without attraction to people of the same sex, or to a sexual orientation. As a sexual orientation, homosexuality refers to "an enduring pattern of or disposition to experience sexual, affectional, or romantic attractions primarily to" people of the same sex; "it also refers to an individual’s sense of personal and social identity based on those attractions, behaviors expressing them, and membership in a community of others who share them."[1][2] The exact proportion of the population that is homosexual is difficult to estimate reliably,[3] but studies place it at 2-7%.[4][5][6][7][8][9][10][11][12]

Sexual orientation is also distinguished from other aspects of sexuality, "including biological sex (the anatomical, physiological, and genetic characteristics associated with being male or female), gender identity (the psychological sense of being male or female), and social gender role (adherence to cultural norms defining feminine and masculine behavior)."[2]

Etymologically, the word homosexual is a Greek and Latin hybrid with homos (often confused with the later Latin meaning of "man", as in Homo sapiens) deriving from the Greek word for same, thus connoting sexual acts and affections between members of the same sex, including lesbianism.[13][14] In a narrow sense, gay refers to male homosexuality, but it often is used in its broadest sense, especially in media headlines and reports, to refer to homosexuality in general. Lesbian, however, always denotes female homosexuality.

There is much evidence of both acceptance and repression of homosexual behavior throughout recorded history. In the last few decades, there has been a trend towards increased visibility, recognition, and legal rights for homosexuals, including marriage and civil unions, parenting rights, and equal access to health care.

Homosexual behavior occurs among numerous non-human animals and particularly among social animals.[15]

Homosexuality has been a feature of human culture since earliest history (see History section below). Generally and most famously in ancient Greece, certain forms of erotic attraction and sexual pleasure between males were often an ingrained, accepted part of the cultural norm. Particular sexual activities (such as anal sex in some cultures, or oral sex in others), however, were disapproved of, even as other aspects were admired. In cultures under the sway of Abrahamic religions, the law and the church established sodomy as a transgression against divine law, a "crime against nature" practiced by choice, and subject to severe penalties, up to capital punishment—often inflicted by means of fire so as to purify the unholy action. The condemnation of penetrative sex between males, however, predates Christian dogma, as it was frequent in Ancient Greece, whence the theme of action "against nature," traceable to Plato, originated.[16]

In the course of the twentieth century, homosexuality became a subject of considerable study and debate in Western societies, especially after the modern gay rights movement began in 1969. Once viewed by authorities as a pathology or mental illness to be cured, homosexuality is now more often investigated as part of a larger impetus to understand the biology, psychology, politics, genetics, history and cultural variations of sexual practice and identity. The legal and social status of people who engage in homosexual acts or identify as gay or lesbian varies enormously across the world and in places remains hotly contested in political and religious debate.

The adjective homosexual describes behavior, relationships, people, etc. The adjectival form literally means "same sex", being a hybrid formed from the Greek prefix homo- ("same"), and the Latin root sex. Many modern style guides in the U.S. recommend against using homosexual as a noun, instead using gay man or lesbian.[20] Similarly, some recommend completely avoiding usage of homosexual as having a negative and discredited clinical history and because the word only refers to one's sexual behavior, and not to romantic feelings.[20]Gay and lesbian are the most common alternatives. The first letters are frequently combined to create the initialismLGBT (sometimes written as GLBT), in which B and T refer to bisexuals and transgender people. These style guides are not always followed by mainstream media sources.[21]

The first known appearance of homosexual in print is found in an 1869 German pamphlet by the Austrian-born novelist Karl-Maria Kertbeny, published anonymously.[22] The prevalence of the concept owes much to the work of the German psychiatrist Richard Freiherr von Krafft-Ebing and his 1886 work Psychopathia Sexualis.[23] As such, the current use of the term has its roots in the broader 19th century tradition of personality taxonomy. These continue to influence the development of the modern concept of sexual orientation, gaining associations with romantic love and identity in addition to its original, exclusively sexual meaning.

Although early writers also used the adjective homosexual to refer to any single-sex context (such as an all-girls' school), today the term is used exclusively in reference to sexual attraction and activity. The term homosocial is now used to describe single-sex contexts that are not specifically sexual. There is also a word referring to same-sex love, homophilia. Other terms include men who have sex with men or MSM (used in the medical community when specifically discussing sexual activity), homoerotic (referring to works of art), heteroflexible (referring to a person who identifies as heterosexual, but occasionally engages in same-sex sexual activities), and metrosexual (referring to a non-gay man with stereotypically gay tastes in food, fashion, and design). Pejorative terms in English include queer, faggot, fairy, poof, and homo. Beginning in the 1990s, some of these have been "reclaimed" as positive words by gay men and lesbians, as in the usage of queer studies, queer theory, and even the popular American television program Queer Eye for the Straight Guy. As with ethnic slurs and racial slurs, however, the misuse of these terms can still be highly offensive; the range of acceptable use depends on the context and speaker. Conversely, gay, a word originally embraced by homosexual men and women as a positive, affirmative term (as in gay liberation and gay rights), has come into widespread pejorative use among young people.

A common thread of constructionist argument is that no one in antiquity or the Middle Ages experienced homosexuality as an exclusive, permanent, or defining mode of sexuality. John Boswell has countered this argument by citing ancient Greek writings by Plato,[26] which he says indicate a knowledge of exclusive homosexuality.

Though often ignored or suppressed by European explorers and colonialists, homosexual expression in native Africa was also present and took a variety of forms. Anthropologists Stephen Murray and Will Roscoe reported that women in Lesotho engaged in socially sanctioned "long term, erotic relationships," named motsoalle.[27]E. E. Evans-Pritchard also recorded that male Azande warriors (in the northern Congo) routinely took on boy-wives between the ages of twelve and twenty, who helped with household tasks and participated in intercrural sex with their older husbands. The practice had died out by the early 20th century, after Europeans had gained control of African countries, but was recounted to Evans-Pritchard by the elders he spoke to.[28]

In North American Native Society, the most common form of same-sex sexuality seems to center around the figure of the Two-Spirit individual. Such people seem to have been recognized by the majority of tribes, each of which had its particular term for the role. Typically the two-spirit individual was recognized early in life, was given a choice by the parents to follow the path, and if the child accepted the role then the child was raised in the appropriate manner, learning the customs of the gender it had chosen. Two-spirit individuals were commonly shamans and were revered as having powers beyond those of ordinary shamans. Their sexual life would be with the ordinary tribe members of the same sex. Male two-spirit people were prized as wives because of their greater strength and ability to work.

discovered that the village of Quarequa [in modern-day Panama] was stained by the foulest vice. The king’s brother and a number of other courtiers were dressed as women, and according to the accounts of the neighbours shared the same passion. Vasco ordered forty of them to be torn to pieces by dogs. The Spaniards commonly used their dogs in fighting against these naked people, and the dogs threw themselves upon them as though they were wild boars on timid deer.[31]

In East Asia, same-sex love has been referred to since the earliest recorded history. Early European travelers were taken aback by its widespread acceptance and open display. None of the East Asian countries today have specific legal prohibitions against homosexuality or homosexual behavior.

Homosexuality in China, known as the pleasures of the bitten peach,the cut sleeve, or the southern custom, has been recorded since approximately 600 BCE. These euphemistic terms were used to describe behaviors, but not identities (recently Chinese society has adapted the term "brokeback," 斷背 duanbei, from the success of Taiwanese director Ang Lee's film Brokeback Mountain).[32] The relationships were marked by differences in age and social position. However, the instances of same-sex affection and sexual interactions described in the Hong Lou Meng (Dream of the Red Chamber, or Story of the Stone) seem as familiar to observers in the present as do equivalent stories of romances between heterosexuals during the same period.

This same-sex love culture gave rise to strong traditions of painting and literature documenting and celebrating such relationships.

Similarly, in Thailand, Kathoey, or "ladyboys," have been a feature of Thai society for many centuries, and Thai kings had male as well as female lovers. While Kathoey may encompass simple effeminacy or transvestism, it most commonly is treated in Thai culture as a third gender. They are generally accepted by society, and Thailand has never had legal prohibitions against homosexuality or homosexual behavior.

The earliest Western documents (in the form of literary works, art objects, as well as mythographic materials) concerning same-sex relationships are derived from ancient Greece. They depict a world in which relationships with women and relationships with youths were the essential foundation of a normal man's love life. Same-sex relationships were a social institution variously constructed over time and from one city to another. The formal practice, an erotic yet often restrained relationship between a free adult male and a free adolescent, was valued for its pedagogic benefits and as a means of population control, though occasionally blamed for causing disorder. Plato praised its benefits in his early writings,[33] but in his late works proposed its prohibition.[34]

In Ancient Rome the situation was reversed. Though the young male body remained a focus of male sexual attention, free boys were off limits as sexual partners. All the emperors with the exception of Claudius took male lovers. The Hellenophile emperor Hadrian is renowned for his relationship with Antinous, but the Christian emperor Theodosius I decreed a law on August 6, 390, condemning passive males to be burned at the stake. Justinian, towards the end of his reign, expanded the proscription to the active partner as well (in 558), warning that such conduct can lead to the destruction of cities through the "wrath of God". Notwithstanding these regulations, taxes on brothels of boys available for homosexual sex continued to be collected until the end of the reign of Anastasius I in 518.

During the Renaissance, rich cities in northern Italy, Florence and Venice in particular, were renowned for their widespread practice of same-sex love, engaged in by a considerable part of the male population and constructed along the classical pattern of Greece and Rome.[35][36] But even as many of the male population were engaging in same-sex relationships, the authorities, under the aegis of the Officers of the Night court, were prosecuting, fining, and imprisoning a good portion of that population. The eclipse of this period of relative artistic and erotic freedom was precipitated by the rise to power of the moralizing monk Girolamo Savonarola. In northern Europe the artistic discourse on sodomy was turned against its proponents by artists such as Rembrandt, who in his Rape of Ganymede no longer depicted Ganymede as a willing youth, but as a squalling baby attacked by a rapacious bird of prey.

The relationships of socially prominent figures, such as King James I and the Duke of Buckingham, served to highlight the issue, including in anonymously authored street pamphlets: "The world is chang'd I know not how, For men Kiss Men, not Women now;...Of J. the First and Buckingham: He, true it is, his Wives Embraces fled, To slabber his lov'd Ganimede;" (Mundus Foppensis, or The Fop Display'd, 1691.)

Love Letters Between a Certain Late Nobleman and the Famous Mr. Wilson was published in 1723 in England and was presumed to be a novel by some modern scholars. The 1749 edition of John Cleland's popular novel Fanny Hill includes a homosexual scene, but this was removed in its 1750 edition. Also in 1749, the earliest extended and serious defense of homosexuality in English, Ancient and Modern Pederasty Investigated and Exemplified, written by Thomas Cannon, was published, but was suppressed almost immediately. It includes the passage, "Unnatural Desire is a Contradiction in Terms; downright Nonsense. Desire is an amatory Impulse of the inmost human Parts."[37] Around 1785 Jeremy Bentham wrote another defense, but this was not published until 1978.[38] Executions for sodomy continued in the Netherlands until 1803, and in England until 1835.

Between 1864 and 1880 Karl Heinrich Ulrichs published a series of twelve tracts, which he collectively titled Research on the Riddle of Man-Manly Love. In 1867 he became the first self-proclaimed homosexual person to speak out publicly in defense of homosexuality when he pleaded at the Congress of German Jurists in Munich for a resolution urging the repeal of anti-homosexual laws.

Sir Richard Francis Burton's Terminal Essay, Part IV/D appendix in his translation of The Book of the Thousand Nights and a Night (1885–86) provided an effusive overview of homosexuality in the Middle East and tropics. Sexual Inversion by Havelock Ellis, published in 1896, challenged theories that homosexuality was abnormal, as well as stereotypes, and insisted on the ubiquity of homosexuality and its association with intellectual and artistic achievement. Appendix A included A Problem in Greek Ethics by John Addington Symonds, which had been privately distributed in 1883. Beginning in 1894 with Homogenic Love, Socialist activist and poet Edward Carpenter wrote a string of pro-homosexual articles and pamphlets, and "came out" in 1916 in his book My Days and Dreams.

Among many Middle Eastern Muslim cultures egalitarian or age-structured homosexual practices were, and remain, widespread and thinly veiled. The prevailing pattern of same-sex relationships in the temperate and sub-tropical zone stretching from Northern India to the Western Sahara is one in which the relationships were—and are—either gender-structured or age-structured or both. In recent years, egalitarian relationships modeled on the western pattern have become more frequent, though they remain rare. Same-sex intercourse officially carries the death penalty in several Muslim nations: Saudi Arabia, Iran, Mauritania, northern Nigeria, Sudan, and Yemen.[39]

A tradition of art and literature sprang up constructing Middle Eastern homosexuality. Muslim—often Sufi—poets in medieval Arab lands and in Persia wrote odes to the beautiful wine boys who served them in the taverns. In many areas the practice survived into modern times, as documented by Richard Francis Burton, André Gide, and others.

In Persia homosexuality and homoerotic expressions were tolerated in numerous public places, from monasteries and seminaries to taverns, military camps, bathhouses, and coffee houses. In the early Safavid era (1501–1723), male houses of prostitution (amrad khane) were legally recognized and paid taxes. Persian poets, such as Sa’di (d. 1291), Hafez (d. 1389), and Jami (d. 1492), wrote poems replete with homoerotic allusions. The two most commonly documented forms were commercial sex with transgender young males or males enacting transgender roles exemplified by the köçeks and the bacchás, and Sufi spiritual practices in which the practitioner admired the form of a beautiful boy in order to enter ecstatic states and glimpse the beauty of god. Some crossed over from the idealized chaste form of the practice to one in which the desire is consummated[citation needed].

In the Turkic-speaking areas, one manifestation of this same-sex love was the bacchá, adolescent or adolescent-seeming male entertainers and sex workers[citation needed]. In other areas male love continues to surface despite efforts to keep it quiet[citation needed].

Today, governments in the Middle East often ignore, deny the existence of, or criminalize homosexuality. Iranian President Mahmoud Ahmadinejad, during his famous 2007 speech at Columbia University, asserted that there were no gay people in Iran. Gay people do live in Iran, but most keep their sexuality a secret for fear of government sanction or rejection by their families.[40]

In many societies of Melanesia, especially in Papua New Guinea, same-sex relationships were, until the middle of the last century, an integral part of the culture. The Etoro and Marind-anim for example, even viewed heterosexuality as sinful and celebrated homosexuality instead. In many traditional Melanesian cultures a pre-pubertal boy would be paired with an older adolescent who would become his mentor and who would "inseminate" him (orally, anally, or topically, depending on the tribe) over a number of years in order for the younger to also reach puberty. Many Melanesian societies, however, have become hostile towards same-sex relationships since the introduction of Christianity by Europeanmissionaries.[41]

Measuring the prevalence of homosexuality presents a number of difficulties:

Survey data regarding stigmatized or deeply personal feelings or activities are often inaccurate. Participants often avoid answers which they feel society, the survey-takers, or they themselves dislike.[citation needed]

The research must measure some characteristic that may or may not be defining of sexual orientation. The class of people with same-sex desires may be larger than the class of people who act on those desires, which in turn may be larger than the class of people who self-identify as gay/lesbian/bisexual.[42]

In studies measuring sexual activity, respondents may have different ideas about what constitutes a "sexual act."[citation needed]

Reliable data as to the size of the gay and lesbian population is of value in informing public policy.[42] For example, demographics would help in calculating the costs and benefits of domestic partnership benefits, of the impact of legalizing gay adoption, and of the impact of the U.S. military's Don't Ask Don't Tell policy.[42] Further, knowledge of the size of the "gay and lesbian population holds promise for helping social scientists understand a wide array of important questions—questions about the general nature of labor market choices, accumulation of human capital, specialization within households, discrimination, and decisions about geographic location."[42]

Estimates of the incidence of exclusive homosexuality range from >1% to 10% of the population, usually finding there are slightly more gay men than lesbians.[43][44][45]

Estimates also vary from one country to another. A 1992 study reported that 6.1% of males in Britain had a homosexual experience, while in France that number was 4.1%.[46]

Societal attitudes towards same-sex relationships vary over time and place, from expecting all males to engage in same-sex relationships, to casual integration, through acceptance, to seeing the practice as a minor sin, repressing it through law enforcement and judicial mechanisms, and to proscribing it under penalty of death.

Most nations do not impede consensual sex between unrelated persons above the local age of consent. Some jurisdictions further recognize identical rights, protections, and privileges for the family structures of same-sex couples, including marriage. Some nations mandate that all individuals restrict themselves to heterosexual relationships; that is, in some jurisdictions homosexual activity is illegal. Offenders face up to the death penalty in some fundamentalist Muslim areas such as Iran and parts of Nigeria. There are, however, often significant differences between official policy and real-world enforcement.
See Violence against gays, lesbians, bisexuals, and the transgendered.

In many cultures, gay and lesbian people are frequently subject to prejudice and discrimination. Like many other minority groups that are the objects of prejudice, they are also subject to stereotyping. Gay men are seen as effeminate and fashionable, often identified with a lisp or a female-like tone and lilt.[47][48][49] They are stereotyped as being promiscuous[citation needed] and unsuccessful in developing enduring romantic relationships[citation needed], despite research to the contrary.[50] Gay men are also often alleged as having pedophiliac tendencies and more likely to commit child sexual abuse than the heterosexual male population, a view rejected by mainstream psychiatric groups and contradicted by research.[51][52][53] Lesbians are seen as butch, and sometimes "man-haters"[54] or radical feminists.[55]

Homosexuality has at times been used as a scapegoat by governments facing problems. For example, during the early 14th century, accusations of homosexual behavior were instrumental in disbanding the Knights Templar under Philip IV of France, who profited greatly from confiscating the Templars' wealth. In the 20th century, Nazi Germany's persecution of homosexual people was based on the proposition that they posed a threat to "normal" masculinity as well as a risk of contamination to the "Aryan race".

In the 1950s, at the height of the Red Scare in the United States, hundreds of federal and state employees were fired because of their homosexuality in the so-called Lavender Scare. (Ironically, politicians opposed to the scare tactics of McCarthyism tried to discredit Senator Joseph McCarthy by hinting during a televised Congressional committee meeting that McCarthy's top aide, Roy Cohn, was homosexual, as he in fact was.)

A recent instance of scapegoating is the burning of 6,000 books of homoerotic poetry of 8th c. Persian-Arab poet Abu Nuwas by the Egyptian Ministry of Culture in January 2001, to placate Islamic fundamentalists.[56][57]

Employment discrimination refers to discriminatory employment practices such as bias in hiring, promotion, job assignment, termination, and compensation, and various types of harassment. In the United States there is "very little statutory, common law, and case law establishing employment discrimination based upon sexual orientation as a legal wrong."[58] Some exceptions and alternative legal strategies are available. President Bill Clinton's Executive Order 13087 (1998) prohibits discrimination based on sexual orientation in the competitive service of the federal civilian workforce,[59] and federal non-civil service employees may have recourse under the due process clause of the U.S. Constitution.[60] Private sector workers may have a Title VII action under a quid pro quo sexual harassment theory,[61] a "hostile work environment" theory,[62] a sexual stereotyping theory,[63] or others.[58]

Housing discrimination refers to discrimination against potential or current tenants by landlords. In the United States, there is no federal law against such discrimination on the basis of sexual orientation or gender identity, but at least thirteen states and many major cities have enacted laws prohibiting it.[64]

In the United States, the FBI reported that 15.6% of hate crimes reported to police in 2004 were based on perceived sexual orientation. Sixty-one percent of these attacks were against gay men.[69] The 1998 murder of Matthew Shepard, a gay student, is one of the most notorious incidents in the U.S.

Since the 1960s, in part due to their history of shared oppression, many LGBT people in the West, particularly those in major metropolitan areas, have developed a so-called gay culture. To many, gay culture is exemplified by the gay pride movement, with annual parades and displays of rainbow flags. Yet not all LGBT people choose to participate in "queer culture", and many gay men and women specifically decline to do so. To some it seems to be a frivolous display, perpetuating gay stereotypes. To some others, the gay culture represents heterophobia and is scorned as widening the gulf between gay and non-gay people.

With the outbreak of AIDS in the early 1980s, many LGBT groups and individuals organized campaigns to promote efforts in AIDS education, prevention, research, patient support, and community outreach, as well as to demand government support for these programs. Gay Men's Health Crisis, Project Inform, and ACT UP are some notable American examples of the LGBT community's response to the AIDS crisis.

LGBT movements are opposed by a variety of individuals and organizations. Supporters of the traditional marriage movement believe that all sexual relationships with people other than an opposite-sex spouse undermines the traditional family[71] and that children should be reared in homes with both a father and a mother.[72][73]

There is also concern that gay rights may conflict with individual's freedom of speech,[74][75][76][77][78] religious freedoms in the workplace,[79][80] and the ability to run churches,[81] charitable organizations[82][83] and other religious organizations[84] in accordance with one's religious views. There is also concern that the acceptance of homosexual relationships by religious organizations might be forced through threatening to remove the tax-exempt status of churches whose views don't align with those of the government.[85][86][87][88]

Many people who feel attracted to members of their own sex have a so-called "coming out" at some point in their lives. Generally, coming out is described in three phases. The first phase is the phase of "knowing oneself," and the realization or decision emerges that one is open to same-sex relations. This is often described as an internal coming out. The second phase involves one's decision to come out to others, e.g. family, friends, and/or colleagues. This occurs with many people as early as age 11, but others do not clarify their sexual orientation until age 40 or older. The third phase more generally involves living openly as an LGBT person.[89] In the United States today, people often come out during high school or college age. At this age, they may not trust or ask for help from others, especially when their orientation is not accepted in society. Sometimes their own parents are not even informed.

Outing is the practice of publicly revealing the sexual orientation of a closeted person.[90] Notable politicians, celebrities, military service people, and clergy members have been outed, with motives ranging from malice to political or moral beliefs. Many commentators oppose the practice altogether,[91] while some encourage outing public figures who use their positions of influence to harm other gay people.[92]

No informationHomosexuality legal Same sex marriages Same sex unions No same sex unions International marriage licenses recognizedHomosexuality illegal Minimal penalty Large penalty Life in prison Death penalty

Government recognition of same-sex marriage is presently available in seven countries and two U.S. states. The Netherlands was the first country to authorize same-sex marriage in 2001 and they are now also recognized in Belgium, Canada, South Africa, Spain, Norway,[93]United Kingdom and the U.S. states of Massachusetts, California and Iowa, though Iowa's issuance of marriage licenses is on hold until a Supreme Court appeal is heard. The states of New York, Rhode Island and New Mexico do not allow same-sex marriages to be performed, but do recognize such marriages performed elsewhere. Israel's High Court of Justice ruled to recognize same-sex marriages performed in other countries, although it is still illegal to perform them within the country.

Other countries, including the majority of European nations, have enacted laws allowing civil unions, designed to give gay couples similar rights as married couples concerning legal issues such as inheritance and immigration. Most Scandinavian countries (Denmark, Sweden, Iceland, Finland, with the sole exception of the Faroe Islands) have enacted civil union laws.

Jurisdictions in the U.S. that offer civil unions or domestic partnerships granting nearly all of the state-recognized rights of marriage to same-sex couples include California (2000), Vermont (2000), Connecticut (2005), New Jersey (2006), Oregon (2007), and New Hampshire (2008). States in the U.S. with domestic partnerships or similar status granting some of the rights of marriage include Hawaii (1996), Maine (1999), Washington (2007), as well as the District of Columbia (Washington, DC) (2001).

Many openly LGBT people are parents, often by way of adoption, donor insemination, foster parenting, or surrogacy. In the 2000 U.S. Census, 33 percent of female same-sex couple households and 22 percent of male same-sex couple households reported at least one child under the age of 18 living in the home.[94] In January 2008, the European Court of Human Rights ruled that homosexual people have the right to adopt a child.[95][96]

there is no scientific evidence that parenting effectiveness is related to parental sexual orientation: lesbian and gay parents are as likely as heterosexual parents to provide supportive and healthy environments for their children…research has shown that the adjustment, development, and psychological well-being of children is unrelated to parental sexual orientation and that the children of lesbian and gay parents are as likely as those of heterosexual parents to flourish….[94]

The strongest conclusion that can be drawn from the empirical literature is that the vast majority of studies show that children living with two mothers and children living with a mother and father have the same levels of social competence. A few studies suggest that children with two lesbian mothers may have marginally better social competence than children in traditional nuclear families, even fewer studies show the opposite, and most studies fail to find any differences. The very limited body of research on children with two gay fathers supports this same conclusion.[99]

Negative societal attitudes toward homosexuality are said to contribute to stress and related mental disorders, and even suicide, in the LGBT community. However, evidence indicates that the liberalization of these attitudes over the past few decades is associated with a decrease in such mental health risks among younger LGBT people.[102]

Gay and lesbian youth bear an increased risk of suicide, substance abuse, school problems, and isolation because of a "hostile and condemning environment, verbal and physical abuse, rejection and isolation from family and peers".[103]

LGB youths are more likely to report psychological and physical abuse by parents or caretakers, and more sexual abuse. Suggested reasons for this disparity are that (1) LGBT youths may be specifically targeted on the basis of their perceived sexual orientation or gender non-conforming appearance, and (2) "risk factors associated with sexual minority status, including discrimination, invisibility, and rejection by family members... may lead to an increase in behaviors that are associated with risk for victimization, such as substance abuse, sex with multiple partners, or running away from home as a teenager."[104]

Crisis centers in larger cities and information sites on the Internet have arisen to help youth and adults.[105]The Trevor Helpline, a suicide prevention helpline for gay youth, was established following the 1998 airing on HBO of the Academy Award winning short film Trevor.

Some ancient and pre-modern societies, such as Greece and Japan, fostered erotic love bonds between experienced warriors and their apprentices. It was believed that a man and youth who were in love with each other would fight harder and with greater morale. A classic example of a military force built upon this belief is the Sacred Band of Thebes.

The adoption of Christianity by the Roman Emperor Constantine in the fourth century and subsequent predominance of Christianity led to a diminished emphasis on erotic love among military forces. By the time of the Crusades, the military of Europe had largely switched gears, asserting that carnal relations between males were sinful and therefore had no place in an army that served their perception of God's will. The Knights Templar, a prominent military order, was destroyed by accusations (probably fabricated) of sodomy.

The United Kingdom, Canada, the Netherlands, and Israel admit openly gay service members, and others—like the United States, and many nations in South America and the Caribbean—either quiet or discharge anyone found to be engaging in homosexual relations or openly identifying as gay; the United States is known for its 1993 "don't ask, don't tell" policy. The traditional justification for excluding openly gay service members is that it may lead to "harassment, discord, blackmail, bullying or an erosion of unit cohesion or military effectiveness".[106] The British military, which removed their restriction against gay service members in 2000, has not experienced any of these feared results.[106]

Religions have had differing views about love and sexual relations between people of the same sex.
Presently, a large proportion of the Abrahamic sects view sexual relationships outside of a heterosexual marriage, including homosexual sex, negatively, though there are groups within each faith that disagree with orthodox positions and challenge their doctrinal authority. Opposition to homosexual behavior ranges from quietly discouraging displays and activities to those who explicitly forbid same-sex sexual practices among adherents and actively oppose social acceptance of homosexual relationships. Support of homosexual behavior is reflected in the acceptance of sexually heterodox individuals in all functions of the church, and sanctification of same-sex unions.

Partially because of religious reasons, some gay men and lesbians seek to change their sexual orientations through religious faith and practice. In a survey of 882 people who were undergoing conversion therapy, attending ex-gay groups or ex-gay conferences, 22. 9% reported they had not undergone any changes, 42.7% reported some changes, and 34.3% reported much change in sexual orientation.[107]Exodus International is the largest ostensibly ex-gay group. A major ally of Exodus International is Focus on the Family, who works with Exodus International in their Love Won Out ministry.

The overall trend of greater acceptance of gay men and women in the latter part of the 20th century was not limited to secular institutions; it was also seen in some religious institutions. Reform Judaism, the largest branch of Judaism outside Israel has begun to facilitate religious weddings for gay adherents in their synagogues. Jewish Theological Seminary, considered to be the flagship institution of Conservative Judaism, decided in March 2007 to begin accepting gay and lesbian applicants, after scholars who guide the movement lifted the ban on gay ordination.[108] In 2005, the United Church of Christ became the largest Christian denomination in the United States to formally endorse same-sex marriage.

On the other hand, the Anglican Communion encountered discord that caused a rift between the African (except Southern Africa) and Asian Anglican churches on the one hand and North American churches on the other when American and Canadian churches openly ordained gay clergy and began blessing same-sex unions. Other churches such as the Methodist Church had experienced trials of gay clergy who some claimed were a violation of religious principles resulting in mixed verdicts dependent on geography.

Some religious groups have even promoted boycotts of corporations whose policies support the LGBT community. In early 2005, the American Family Association threatened a boycott of Ford products to protest Ford's perceived support of "the homosexual agenda and homosexual marriage".[109]

The record of same-sex love has been preserved through literature and art. Male homoerotic sensibilities are visible in the foundations of art in the West, to the extent that those roots can be traced back to the ancient Greeks. Homer's Iliad is considered to have the love between two men as its central feature, a view held since antiquity. Plato's Symposium also gives readers commentary on the subject, at one point putting forth the claim that male homosexual love is superior to heterosexual love.

The European tradition of homoeroticism was continued in the works of artists and writers such as Leonardo da Vinci, Michelangelo and Shakespeare. Since the Renaissance, both male and female homoeroticism has remained a common, if subtle and hidden, theme in the visual arts of the West.

In Islamic societies homoeroticism was present in the work of such writers as Abu Nuwas and Omar Khayyam. A large corpus of literature, numbering in the hundreds of works, fostered the shudo tradition in Japan, together with a widespread tradition of homoerotic shunga art.[110]

In the Chinese literary tradition, works such as Bian er Zhai and Jin Ping Mei survivd th many purges to record the homoerotic climate of their time. Today, the Japanese anime subgenre yaoi centers on gay youths. Japan is unusual in that the culture's male homoerotic art has typically been the work of female artists addressing a female audience, mirroring the case of lesbian eroticism in western art.

In the twentieth century, entertainers such as Noel Coward, Madonna, k.d. lang, and David Bowie have brought homoeroticism into the field of western popular music. It is through these and other modern songwriters and poets that female homoerotic work by women, rather than erotic art by men with lesbian themes, has had its greatest cultural impact in the West since the ancient Greek poet Sappho.

In the 1990s, a number of American television comedies began to feature homosexual themes, and characters who expressed same-sex attractions. The 1997 coming-out of comedian Ellen DeGeneres on her show Ellen was front-page news in America and brought the show its highest ratings. However, public interest in the show swiftly declined after this, and the show was cancelled after one more season. Immediately afterward, Will & Grace, which ran from 1998 to 2005 on NBC, became the most successful series to date focusing on male homosexuality.

Scholars who study the social construction of homosexuality investigate the various forms that same-sex relationships have taken in different societies, and look for patterns as well as differences. Their work suggests that the concept of homosexuality would best be rendered as "homosexualities". Anthropologists group these socio-historical variations into three separate categories:[111][112]

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Egalitarian

Features two partners with no relevance to age. Additionally, both play the same socially accepted sex role as heterosexuals of their own sex. This is exemplified by relationships currently prevalent in Western society between partners of similar age and sex.

Features partners of different ages, usually one adolescent and the other adult. This is exemplified by pederasty among the Classical Greeks or those engaged in by novice samurai with more experienced warriors; southern Chinese boy marriage rites; and ongoing Central Asian and Middle Eastern practices.

Usually in any society one form of homosexuality predominates, though others are likely to co-exist. As historian Rictor Norton points out in his Intergenerational and Egalitarian Models, in ancient Greece egalitarian relationships co-existed (albeit less privileged) with the institution of pederasty, and fascination with adolescents can also be found in modern sexuality, both heterosexual and homosexual. Egalitarian homosexuality is the principal form present in the Western world, while age- and gender-structured homosexuality are less common. As a byproduct of growing Western cultural dominance, this egalitarian homosexuality is spreading from Western culture to non-Western societies, although there are still defined differences between the various cultures.

Individuals may or may not express their sexual orientation in their behaviors.[113] According to a 1990 study of The Social Organization of Sexuality, out of 131 women and 108 men who self-reported same-sex attraction, only 43 men (40%) and 42 women (32%) had participated in gay sex.[114] In comparison, a survey by the Family Pride Coalition showed that 50% of gay men had fathered children[115] and 75% of lesbians had children,[116] and even more have had straight sex without having children.

People who have same-sex partners tend to have more sexual partners overall. The same study showed that men who had at least one male sexual partner in the previous 5 years had an average of 16.7 sexual partners during that time period, while men who only had sex with women had an average of 4.8 sexual partners during that time. Women with female sexual partners had an average of 10.1 partners while women with only male partners had an average of 2.2 partners.[117]

The American Academy of Pediatrics has stated that "sexual orientation probably is not determined by any one factor but by a combination of genetic, hormonal, and environmental influences."[118] The amount that each influence plays is highly debated. One study on Swedish twins suggested that there was a moderate, primarily genetic, familial effects, and moderate to large effects of the nonshared environment (social and biological) on same-sex sexual behavior.[119]

The American Psychological Association has stated that "there are probably many reasons for a person's sexual orientation and the reasons may be different for different people". It also stated that for most people, sexual orientation is determined at an early age.[120]

The American Psychiatric Association has stated that, "to date there are no replicated scientific studies supporting any specific biological etiology for homosexuality. Similarly, no specific psychosocial or family dynamic cause for homosexuality has been identified, including histories of childhood sexual abuse."[121]

Research into how sexual orientation may be determined by genetic or other prenatal factors plays a role in political and social debates about homosexuality, and also raises fears about genetic profiling and prenatal testing.[122]

In 1993, Dean Hamer found the genetic marker Xq28 on the X chromosome. Hamer's study found a link between the Xq28 marker and male homosexuality,[123] but the original study's results have been disputed.[124] Several mutations have been identified in flies, such as changes in the fruitless gene, cause male flies to court and attempt to mate with other males; however, when a modified male fruit fly is isolated with only female fruit flies, then he will attempt to mate with them.[125]

Twin studies give indications that genes may predispose some men to seek partners of the same sex. Hamer commented "From twin studies, we already know that half or more of the variability in sexual orientation is not inherited. Our studies try to pinpoint the genetic factors, not to negate the psychosocial factors."[126] One common type of twin study compares the monozygotic (or identical) twins of people possessing a particular trait to the dizygotic (non-identical, or fraternal) twins of people possessing the trait. Bailey and Pillard (1991) in a study of gay twins found that 52% of monozygotic brothers and 22% of the dizygotic twins were concordant for homosexuality.[127] Bailey, Dunne and Martin (2000) used the Australian twin registry to obtain a sample of 4,901 twins.[128]

The hormonal theory of sexuality holds that, just as exposure to certain hormones plays a role in fetal sex differentiation, such exposure also influences the sexual orientation that emerges later in the adult.[129][130]

Recent studies have found notable differences between the physiology of gay people and non-gay people. There is evidence that:

The average size of the INAH-3 in the brains of gay men is approximately the same size as INAH 3 in women, which is significantly smaller, and the cells more densely packed, than in heterosexual men's brains.[3]

The suprachiasmatic nucleus was found by Swaab and Hopffman to be larger in gay men than in non-gay men,[134] the suprachiasmatic nucleus is also known to be larger in men than in women.[135]

The anterior commissure is larger in women than men and was reported to be larger in gay men than in non-gay men,[136] but a subsequent study found no such difference.[137]

Gay men report, on an average, slightly longer and thicker penises than non-gay men.[138]

The functioning of the inner ear and the central auditory system in lesbians and bisexual women are more like the functional properties found in men than in non-gay women (the researchers argued this finding was consistent with the prenatal hormonal theory of sexual orientation).[140]

The startle response (eyeblink following a loud sound) is similarly masculinized in lesbians and bisexual women.[141]

Recent studies suggest the presence of subtle differences in the way gay people and non-gay people process certain kinds of information. Researchers have found that:

Gay men and lesbians are significantly more likely to be left-handed or ambidextrous than are non-gay men and women;[153][154][155] Simon LeVay argues that because "[h]and preference is observable before birth[156]... [t]he observation of increased non-right-handness in gay people is therefore consistent with the idea that sexual orientation is influenced by prenatal processes," perhaps heredity.[3]

There is evidence from numerous studies that homosexual men tend to have more older brothers than do heterosexual men, known as the "fraternal birth order effect."[164][165] One reported that each older brother increases the odds of being gay by 33%.[166] The fraternal birth order effect is the strongest known predictor of sexual orientation.[167] Interestingly, this relation seems to hold only for right-handed males.[168][169] There has been no observed equivalent for women.[170]Peter Bearman repeated the experiments, but found no correlation between older brothers and male homosexuality and questions the sampling methods used.[171]

The effect has been found even in males not raised with their biological brothers, suggesting an in-utero environmental causation.[167] To explain this finding, a maternal immune response has been hypothesized.[165] Male fetuses produce H-Y antigens which may be involved in the sexual differentiation of vertebrates.[165]

Researchers have found childhood gender nonconformity to be the largest predictor of homosexuality in adulthood.[172]Daryl Bem's Exotic Becomes Erotic theory suggests that some children will prefer activities that are typical of the other sex and that this will make a gender-conforming child feel different from opposite-sex children, while gender-nonconforming children will feel different from children of their own sex, which may evoke physiological arousal when the child is near members of the sex which it considers as being "different", which will later be transformed into sexual arousal. Researchers have suggested that this nonconformity may be a result of genetics, prenatal hormones, personality, parental care or other environmental factors[citation needed]. Peter Bearman showed that males with a female twin are twice as likely to report same-sex attractions, unless there was an older brother. He says that his findings support the hypothesis that less gendered socialization in early childhood and preadolescence shapes subsequent same-sex romantic preferences. He suggests that parents of opposite-sex twins are more likely to give them unisex treatment, but that an older brother establishes gendersocializing mechanisms for the younger brother to follow.[171]

From their research on 275 men in the Taiwanese military, Shu and Lung concluded that "paternal protection and maternal care were determined to be the main vulnerability factors in the development of homosexual males." Key factors in the development of homosexuals were "paternal attachment, introversion, and neurotic characteristics."[173] Other researchers have also provided evidence that gay men report having had less loving and more rejecting fathers, and closer relationships with their mothers, than non-gay men.[174] Whether this phenomenon is a cause of homosexuality, or whether parents behave this way in response to gender-variant traits in a child, is unclear.[175][176]

Innate bisexuality (or predisposition to bisexuality) is a term introduced by Sigmund Freud (based on work by his associate Wilhelm Fliess) that expounds that all humans are born bisexual but through psychological development (which includes both external and internal factors) become monosexual, while the bisexuality remains in a latent state.

The American Psychiatric Association has stated "some people believe that sexual orientation is innate and fixed; however, sexual orientation develops across a person’s lifetime."[121] In combination with other major American medical organizations, they have put out a statement which said: "Sexual orientation develops across a person's lifetime—different people realize at different points in their lives that they are heterosexual, gay, lesbian, or bisexual."[94] A report from the Centre for Addiction and Mental Health states: "For some people, sexual orientation is continuous and fixed throughout their lives. For others, sexual orientation may be fluid and change over time."[177] One study has suggested "considerable fluidity in bisexual, unlabeled, and lesbian women's attractions, behaviors, and identities."[178][179]

However, they have said "most people experience little or no sense of choice about their sexual orientation."[180] American medical organization have further stated therapy cannot change sexual orientation, and have expressed concerns over potential harms.[94] The director of the APA's LGBT Concerns Office explained: "I don't think that anyone disagrees with the idea that people can change because we know that straight people become gays and lesbians.... the issue is whether therapy changes sexual orientation, which is what many of these people claim."[181] The American Psychiatric Association has stated "To date, there are no scientifically rigorous outcome studies to determine either the actual efficacy or harm of "reparative" treatments," and supports research to further determines risks versus its benefits.[182] Similarly, United States Surgeon GeneralDavid Satcher issued a report stating that "there is no valid scientific evidence that sexual orientation can be changed".[183]

Homosexual sexual behavior occurs in the animal kingdom, especially in social species, particularly in marine birds and mammals, monkeys, and the great apes. Homosexual behavior has been observed among 1,500 species, and in 500 of those it is well documented.[186][15] This discovery constitutes a major argument against those calling into question the biological legitimacy or naturalness of homosexuality, or those regarding it as a meditated social decision. For example, male penguin couples have been documented to mate for life, build nests together, and to use a stone as a surrogate egg in nesting and brooding. In a well-publicized story from 2004, the Central Park Zoo in the United States replaced one male couple's stone with a fertile egg, which the couple then raised as their own offspring.[187]

The genetic basis of animal homosexuality has been studied in the fly Drosophila melanogaster.[188] Here, multiple genes have been identified that can cause homosexual courtship and mating.[125] These genes are thought to control behavior through pheromones as well as altering the structure of the animal's brains.[189][190] These studies have also investigated the influence of environment on the likelihood of flies displaying homosexual behavior.[191][192]

Georgetown University professor Janet Mann has specifically theorized that homosexual behavior, at least in dolphins, is an evolutionary advantage that minimizes intraspecies aggression, especially among males.[193] Studies indicating prenatal homosexuality in certain animal species have had social and political implications surrounding the gay rights debate.[194]

↑."... sow illegitimate and bastard seed in courtesans, or sterile seed in males in defiance of nature." Plato in THE LAWS (Book VIII p.841 edition of Stephanus) or p.340, edition of Penguin Books, 1972.

Christopher Bagley and Pierre Tremblay, On the Prevalence of Homosexuality and Bisexuality, in a Random Community Survey of 750 Men Aged 18 to 27, Journal of Homosexuality, Volume 36, Number 2, pages 1–18, 1998